New data on the orbital elements, masses, and luminosities were collected for 31 pre-contact binary systems of short-periodic -type. We treat the catalogued data statistically in order to accurately define the properties and evolutionary status of each class system. The ages of pre-contact systems were estimated by the isochrone method. Numerous comments and bibliographic references to the catalogue are also included.
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Dryomova et al. (2005) studied this question.
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